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Date: Fri, 14 Aug 2009 08:20:14 -0700 (PDT)
From: "Tom White (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-6165) Add metadata to Serializations
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     [ https://issues.apache.org/jira/browse/HADOOP-6165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tom White updated HADOOP-6165:
------------------------------

    Attachment: HADOOP-6165-v3.patch

Here's a new patch which adopts the names suggested by Doug. I've also added AvroGenericSerialization which looks for a schema in the metadata, and a test for it. I haven't added the fallback capability discussed, but it shouldn't be too hard to add.

I've also fixing failing tests, and reduced the number of deprecation warnings - I can't get rid of all of them until the deprecated interfaces are removed.

> Add metadata to Serializations
> ------------------------------
>
>                 Key: HADOOP-6165
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6165
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: contrib/serialization
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-6165-v2.patch, HADOOP-6165-v3.patch, HADOOP-6165.patch
>
>
> The Serialization framework only allows a class to be passed as metadata. This assumes there is a one-to-one mapping between types and Serializations, which is overly restrictive. By permitting applications to pass arbitrary metadata to Serializations, they can get more control over which Serialization is used, and would also allow, for example, one to pass an Avro schema to an Avro Serialization.

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